Gary Mortimer has a good idea
: a DIY time trial contest, where you time your UAV flying autonomously over an agreed-upon course. You upload GPS track, time and, onboard video. Fastest time each month wins something cool that I'll donate (like a Funjet kit).
What kind of course would work best for this? For starters, how about this: a square, 400m on a side. Must complete three full circuits in fully autonomous mode. Carry an onboard GPS datalogger or datalog from your telemetry stream and upload the file (so people can see timestamps).
How does that sound?
(pic stolen from Gary's comment below)